cleaning keyboards in the dishwasher

It could be sodium hydroxide (aka lye, also used in drain cleaning products), potassium hydroxide, or a similar caustic. From my other hobby life (home brewing): dishwasher detergents that contain these alkalis are great at removing scorched malt from your (stainless) boiling pot, and they are a little safer to handle than the powder bags of it that you can buy at many brewing supply houses. But strong alkalis will etch glass chemically and put a haze on it over time. Certainly, but you're also putting a fairly caustic solution on it to help it along, at least for some metals. I have brass fittings on hose assemblies that turn black during cleaning with detergent (which I now avoid). And beware of aluminum trim on things, which will lose their shine. Copper doesn't seem very reactive though--a Good Thing, since you home's pipes are likely copper, but I'm not entirely sure, since those pipes also carry a lot of water otherwise to dilute the solution. I don't know of any dish soaps that contain lye (but we've used one brand for years). I think it would be too hard on your hands (or those of she who must be obeyed) to be a popular product. Patrick