any advice on cleaning my rescue geldings sheath? He's funny about anyone going anywhere behind his flank, he's finally starting to trust me, but he hates water, and I wouldn't put it past him to kick
It took probably 4 years before I could really clean my Mustang gelding's sheath easily. And I still can't use a water hose, but he finally tolerates a wet sock and a bucket of warm water.
I would just start by grooming him with a brush in the normal areas, and then get progressively closer to the areas he is funny about. If he likes being brushed, then hopefully over time with lots of nice grooming sessions, you can get him used to being brushed around the belly and sheath area where he is sensitive. Eventually you can then start rubbing your hand along the belly and over and around the sheath, and then eventually you can try touching inside.
I sort of did the same thing with my foal. He was sensitive to his belly and sheath being touched because he had a navel infection right after he was born and it had to be doctored. So he would try to cow-kick when I touched his belly. But he loved being brushed, so I would brush his neck, back, withers, rump, all the "good" places and then gradually work my way around his navel, then back to the good areas, then back into the areas he didn't like, but all like it was a natural part of the grooming session and eventually he got over it and I can now run my hand along his navel and sheath.
So I don't have any quicker, better advice, sorry. But by grooming in spots they like, and then "accidentially" venturing into areas they don't, they seem to get used to it over time.