The packaging for each cloth gives detailed information but, if you no longer have it, some general tips are:
We recommend the following:
For cleaning thick grease, dirt and bacteria.
(E.g. The General Purpose, Bath & Shower Cloths.)
For cleaning light grease and dirt from glass and shiny surfaces.
(E.g. Glass & Polishing, Screen & Finishing Cloths.)
Using the Glass & Polishing Cloth on stainless steel will give excellent results. However:
You can wash as low as 30 degrees C, but most e-cloths can be machine washed at 90°C or boil washed. There are exceptions and all cloths have washing instructions on the label, except for certain lightweight cloths where the cloth’s smear-free performance would be affected by the addition of a stitched edge and label.
For all cloths:
If fabric conditioner is used by mistake, rewash with a little detergent.
As cloths age, some staining will not come out. Some types of dirt contain a pigment which stains any cloth. If the cloth has been washed properly, it will actually be clean. Repeated washes will gradually reduce marks.
Whilst a standard bleach will damage tea towels and cloths, you can use a natural bleach, such as Ecover.