mechanical switches

So, I have a cheapo Cherry MX copy mechanical keyboard, with plate mounted switches, and my spacebar is failing most of the time I try to use it. It happened before, the same thing, but I solved it by just removing the keycap and putting some isopropanol and mashing the key, and that fixed it...

2 days ago I noticed that my "D" key started skipping and not responding as it should, I plugged it in my laptop and it was the same. Today I noticed that my "E" "S" and "D" key were doing the same (2 days ago "E" and "S" worked perfectly), so I somehow found out that blowing into them makes...