I'm in the same boat. I have an electric Ultra Micro T-28 Trojan that I'm using as a trainer of sorts. The rest of my planes are glow powered including a small 1/2a Norvel trainer, but I'd rather crash the tiny foamy that I can repair with scotch tape until I'm comfortable flying the glow planes. Granted, my main interests are cars and boats, but they all need cleaning after running. I only use a bit of synthetic oil in the fuel for my Jetts, but otherwise I use only castor oil and don't mind the bit of mess. Clean up after you're done flying/running for the day and it's a done deal. A little fogging oil or ATF in the engine keeps it free and smooth during storage.