motor spray?
#2
I've used brake cleaner in the past...CRC Brakleen specifically. You can get it at just about any auto supply store. I don't recall it being a problem on plastics, but I only used it on motors so I can't say for sure.
#6
I m using THREE BOND brake cleaner, it works very well and does not melt plastics. I use it on just about anything on my r/c stuff.
#7
Any electronic contact cleaner. Found at Radio Shack, Leow's, Home Depot, Auto parts store. Should evaporate quickly. Online orders Tower Hobby I think still supplies the cleaner.