I forgot. I use to clean remotes that were on job sites for a long time. Covered with grout. It (grout) was in every possible place it could be. I've rescued 20K remote boxes that were set up in 1/2 a yard of grout the only thing sticking UP was the shoulder straps. The ONLY saving grace was, it was still pretty green. I could get them pretty clean believe it or not.. The spare batteries were charged by the equipment, usually eco batteries all the way.. Rugged and expensive smart batteries.
Regards

