• Bosch corporate

Getting the basics right

Using salt and rinse aid to maintain top performance

Tips on using dishwasher salt

Hard water can be harmful to home appliances. Dishwasher salt is supplied in granular form and is needed to regenerate the water softening unit. Specialist dishwasher salt should be used and never table salt. When the salt level is too low, a warning light will show and the salt should be replenished by removing the cap of the salt container and pouring the salt carefully into the opening. If you spill any salt, always run a pre-rinse programme immediately afterwards to clear it away from the base of the appliance. You should also ensure that your water hardness setting is set to the correct level. Your Water Authority can advise you if you are not sure. Please refer to the manual for instructions on how to set the correct level. In some very soft water areas, salt may not be needed.

Why is rinse aid needed?

Rinse aid should always be used in the appliance to maintain excellent drying results. Rinse aid helps to disperse water from the surface of the dishes during the final heated rinse of the programme, which aids the drying process. If the level falls too low, dishes may remain wet and streaky after the end of the programme. It is replaced by filling the special compartment on the inside of the door.



A white limescale film on the dishwasher interior is a sign that salt is not topped up as required or the water hardness is incorrectly set on the appliance.

Not drying

To avoid wet items at the end of the cycle, make sure rinse aid is refilled when required. Ensure water droplets can run easily off all items by stacking dishes correctly.

Plastics not drying

Some plastics such as Tupperware may not dry properly in a dishwasher, but most current models do have an extra drying function which can be used to dry such items.

Using tablets: Not dissolving

If the tablet is not dissolving during a normal programme, check that the dosing chamber is dry and not sticky before use, and that the chamber is not blocked by large dishes. Some customers find that tablets do not dissolve fully when doing a Quick wash. This is because some tablets are not designed to work in a Quick wash due to the length and temperature of the cycle. In this case we would recommend using a liquid or powder detergent.

Using tablets: Foaming

Always scrape off food debris before placing in the dishwasher, but make sure you do not use washing up liquid as this can cause foaming. If you do this in error, a bar of soap placed at the bottom of the appliance is a good way of removing the foam – just remember to remove it before the next use. This can also occur when rinse aid is spilt inside the dishwasher or remains of protein heavy foods are not scraped off plates.

Top dishwashing tips:

Cleaning cutlery and wooden items

Cleaning cutlery

You can take some simple steps to ensure your cutlery is well cleaned and remains in excellent condition.

  • Load your dishwasher correctly as shown in the manual to ensure good water circulation and make sure the spray arms are clean and not blocked. This can help to avoid white starch deposits
  • If you have acidic or salt food residues on your cutlery, make sure these are quickly rinsed off on a pre-rinse cycle to avoid corrosion
  • Low quality cutlery is also less resistant to corrosion, so use high-quality stainless steel cutlery if possible for best dishwashing results
  • Steel and silver cutlery items can also react when placed together in the dishwasher and cause corrosion or discolouration. It is advisable to separate the two types of cutlery to prevent them reacting with each other.

Download our dishwasher loading guide

Wooden items

The cleaning process in a dishwasher is not suitable for items such as wooden chopping boards, wooden spoons and cutlery with wooden handles. Cracking and splitting can take place, so make sure you clean these by hand. If you want to clean this type of kitchenware in the dishwasher, choose items made of other dishwasher-safe materials, which will be more suitable for dishwasher cleaning.

Top dishwashing tips:


Tips on glassware

Always make sure that rinse aid is topped up as this can ensure that droplets do not form. If salt levels are low and water hardness is incorrectly set you may see a milky limescale covering on glasses.

Correct detergent dosage and loading of glassware (allowing water to run off) can avoid streaks and smears. Using high-quality, dishwasher proof glassware and lower temperature programmes can help to avoid glass surface corrosion.

Top dishwashing tips:


Top dishwashing tips:

Always make sure that detergent is correctly dosed for best results. Insufficient dosage can cause yellow/brown residues to remain at the end of the cycle. Dull residues can occur due to incorrect dosage or incorrect loading. Ensure that water can easily drain away. See the back page of the guide for information on cleaning and maintenance which can also improve dishwashing results. Some people find black marks appearing

on plates when they remove them at the end of cycle. Generally, these are scratch marks made beforehand by the cutlery and are unrelated to the dishwashing results. They can often be removed with white vinegar. Make sure you purchase dishwasher-safe crockery to avoid the fading of patterns and decorations.

Essential dishwasher maintenance:

Spray arms and filter unit

Filter units

The filter unit can be removed by unscrewing the filter cylinder at the base of the dishwasher and lifting the unit out. This can then be run under the tap and cleaned before being replaced. Before loading dishes into the dishwasher, always ensure that all food debris is scraped off beforehand. If this is not done, the debris can build up and possibly block the filter, spray arms and pump. If the mesh filter is not regularly cleaned and becomes blocked, food particles may not be removed from the appliance during the cycle and could redeposit on the dishes.

If the pump is blocked, waste water cannot be pumped out of the machine and could cause the programme to stall.

Spray arms

The spray arms distribute the water around the dishwasher and can become clogged with small pieces of food. This can lead to poor washing results if not cleaned. The top arm can be removed by unscrewing it, while the bottom arm will clip off. Check the outlet nozzles. These can be cleaned under the tap using a cocktail stick. The spray arms can then be replaced.

Cleaning and care for your dishwasher:

Tested and approved

Dishwasher care – Regular cleaning
Reduce odours from food debris with this liquid cleaner. Helps to ensure top dishwashing results.
Use every 1–2 months.
Product code: 00311304
Buy now
Dishwasher maintenance cleaning powder – Periodic cleaning
Intensive cleaner to remove tough residues from dishwasher interior.
Use every 4–6 months.
Product code: 00311313
Buy now
Descaler for dishwashers – Limescale removal
Removes harmful limescale deposits, also suitable for washing machines.
Use yearly.
Product code: 00311506
Buy now
2 in 1 Citro Fresh Aroma for dishwashers – Fresh lemon scent
Prevent unpleasant odours in your dishwasher.
Product code: 00460742
Buy now

* Delivery charges not included

Online Survey