skylark With stainless there are three different types of staining you can get:
- rainbow discolouration (this requires a lot of heat, more than an espresso machine)
- tea staining, this is surface corrosion and is a type of rust that can pit…unusual in espresso machines even with the lower stainless grades..usually happens if the surface passivation is damaged in some way on stainless steel outdoors.
- Yours looks like calcium deposits? the other most common stain
Calcium deposits won’t wash off, and stainless cleaners like method won’t remove them. You could try a vinegar on a microfibre cloth…work a smaller area and see if it comes off without damaging the panel (work in the direction of the b brush lines). If it does clean it off, do the whole panel. BUT, you absolutely must neutralise it by cleaning with a damp cloth, drying, then using method or similar non abrasive stainless cleaner. Don’t let it stay to long on brushed stainless.
If calcium deposits are left on too long and continually get damp…as they would on an espresso machine, then they can etch into brushed stainless.
@MediumRoastSteam doesn’t have those and neither do I, probably because I use RO water from the Osmio and MRS uses distilled. I could be wrong of course and would be very curious to know what water you use?
