OK, here's where it gets embarrassing... I've had that problem... Here's what I've done to cope with it.. First, most OTC preps for hemmies do absolutely nuttin.
Just a little pain/itch relief, combined with lubricants.. so, if leaking is a problem, all these will do is increase it (as the lubricant increase the flow of materials). I've talked to a number of GI's & pharmacists.. prescription preps for hemmies is their choice... Second, I buy bulk boxes of pre-packaged no name baby wipes/towels..
Keep a supply close at hand, and always a couple in my pocket at all times. They can be mistaken for condoms in wrappers in my pockets if I wear tight clothing, so it can give some folks the wrong idea, but I'd rather that then them knowing I have to carry baby wipes.. Third, I also wear (and try to carry a spare) feminine panty liners... just positioned to catch any leakage issues.. Who'd have thunk that all the research the fine folks who make these products did so that teenage girls could have something small and discreet to carry would have benefited an old fart like me.. That's right, a thin disposable no name panty liner that I keep in my other back pocket, or even tucked in the cuff of my socks, has provided me with the confidence to go out with friends/family for an evening and not be totally consumed with worry about a potential accident... Talk about equality of the sexes..