Yes liver and heart can be soaked. I only wipe the meat down to remove any hair or debris. The meat needs to stay cool clean and DRY. If it's October I hang it in the shade for a few days large game bags can keeps the flys off. Vinegar also keeps the bugs off. Just spray it down then cover with game bags or sheets. Let cure for a few days to ten days depending on temp. The cooler the temp the longer it can hang for. I'd say 50 and below it can hang for ten days. 55 and up I'd only hang it for three to four days. The point of hanging it up is to let the meat cure like they do with beef. Trim all the fat while it's hung. Then remove the sinue as you break the muscle groups down. Then once the roasts are free offat and sinue. Cut and wrap and freeze ASAP.
Getting the meat wet will ruin the meat. It will speed up the decomp process.
Cool, clean and dry.