Caulk

I stood over the sheriff with my caulking gun, a ribbon of white goo still swinging from the nozzle.
The sheriff was confused. “Do you know how hard it’s going to be to get this crap out of my shirt?”
Not hard at all if you know what you’re doing.
You see, I run the town’s drycleaning shop.
Caulk is easy to get out of a shirt. Easier than blood.
That’s why I gunfight with a caulking gun.
He gets up, draws his gun, and shoots me.
Great. A huge bloodstain on my shirt.
This’ll be a bitch to fix.