An Asko dishwasher is designed around a three-part system: salt for the built-in softener, detergent for the wash, rinse aid for the final rinse. Each does a separate job, and the machine assumes all three are present. Drop one and the results degrade in a way that looks mechanical.
Why the Water Volume Changes the Rules
Asko washes with a small quantity of water recirculated hard and hot rather than a large volume replaced repeatedly. In a small volume, detergent concentration is high and any surplus has nowhere to go. That is why hand dish soap in the tub is genuinely destructive rather than just wasteful: it foams, the foam cushions the spray arms, cleaning collapses, and suds can find their way past the sump. Use only detergent labelled for automatic dishwashers.
Powder, Gel or Tablet
- Powder and gel let you dose to the soil level and to your water hardness, which is the point of having the hardness setting at all. Heavier load, more detergent. Light load, less.
- Tablets deliver a fixed dose. That is convenient and it removes your ability to adapt. All-in-one tablets also include softening and rinse-aid components, which assume conditions that may not match your supply.
- Where the tablet goes matters. Put it in the dispenser, not loose in the bottom of the tub. A loose tablet starts dissolving in the pre-wash and is largely gone before the main wash begins.
- Short and quick programs may not give a tablet time to dissolve completely. If you run short cycles routinely, powder or gel behaves better.
Rinse Aid Is Not Optional
Rinse aid lowers the surface tension of the final rinse so water sheets off rather than beading. Beads dry in place and leave spots; sheets run off and leave very little behind. It also matters for drying, because Asko machines rely on water leaving the surfaces rather than on a long high-temperature bake. Some models use a fan-assisted arrangement to move damp air; the DW90.2 generation even carried a humidity sensor, a fan and a damper. Either way, an empty rinse-aid compartment shows up first as spotting on glass and as plastics that stay wet, and owners regularly report that as a drying fault.
Scrape, Do Not Rinse
Automatic programs use a turbidity sensor to judge how dirty the water is and choose how hard to work. Plates rinsed spotless under the tap give the sensor nothing to read, so the machine runs a light cycle on a load that may include one genuinely greasy pan. Modern detergents also contain enzymes that need something to act on. Scrape solids into the bin, leave the rest, and let the machine do its job.
Reading the Results
- White powdery film that wipes off: usually hardness related. Check salt level, hardness setting and detergent dose.
- Cloudiness that does not wipe off: etching. It is permanent, and it is associated with very soft water, high temperatures and susceptible glass. Reduce the wash temperature for glassware and check the hardness setting is not set far above your actual supply.
- Spots and streaks with good cleaning: rinse aid, or a rinse-aid dose set too low.
- Food left on upper-rack items only: more likely a spray-arm or diverter question than a detergent one.
Keep chlorine bleach out of the machine. If wash quality has fallen away despite correct dosing, the stored fault list is the next place to look, and an Asko dishwasher repair visit can read it.