You can clean your A/C condenser to improve your A/C performance, or help it operate easier. You basically just spray some cleaner on it. ETCG did it and the high pressure side dropped by 60 psi (results 13:38.)

I did it myself today. I used a little bottle I bought at a hardware store for $10. I didn’t test the system so I don’t know how well it works, but I’ll belive the video. Worst case I wasted $10 and an hour hammering out a bracket that magically made itself crooked after I took it off.

It’s called condenser coil cleaner.