Mattress: that's some funny shit, you magnificent OCD bastard...ha!
Kitchen: I'm referring to "room cleaning" which is basically vac and mop, and may or may not involved dusting hard surface and fixtures, baseboards, or whatever the "room" needs. Even though there's just 2 of us, I/We cook a lot, so washing pots, wiping counters, loading and unloading dishwasher, wiping counters, etc. is a just part of the daily grind.
Your sink sprayer: are you sure there's not some filter of some kind in there that's helping to gum up the works? Or we're assuming that it's a bit of hard-water corrosion making that switch stick. Personally, I would totally soak that fucker in CLR, but, man...I really hesitate to tell ya that your finish will be just fine, and then look like an asshole. When you read the label on CLR, however, it will tell you that it's just fine on sink and shower fixtures, and the various materials that are inside your sprayer. Personally, I've never ruined anything with CLR, but there's always a first time, I guess.