New to cycling

[galaxy xr8]

Ok guys, I'm in need of some advice on cleaning/maintenance equipment. My bike (Giant Trance advanced Pro 1 29er, 2019) and I've just purchased a Giant Trance X Advanced Pro 29 2, '22, for my son, I also have my wife's Trance Intrigue Advanced pro 0, I'm looking for recommendations on the best gear to clean the cassette and chain and etc.
Any thoughts ?.


On another note, why is it that I can't get an accurate reading (let alone any reading) when trying to inflate the tyres using my air compressor or Milwaukee air inflator ?, I use the little gold adaptor on the Presta valves but I have no idea on how much pressure is in the tyres, do I need to purchase a foot pump ?, are they the only way to read correct pressures ?.

Cheers.