Meticulously maintain your stuff, never loan out your stuff, and have cat(s) on site to control the Rodentia.
If you don't do all of the above then expect stuff to be wrong with your stuff when you need it most.
I think that cat thing is pushing it over the edge for me. I'll gladly pay for a new wire harness before I allow a cat to cause me constant misery.
About the only allergy I have. Trust me, it was misery when the neighbors downstairs had their cat's and they didn't clean up after them.
I heard a crash one early morning, and a couple hours later they were knocking on my door for help to set their bed back up after the guy lost it due to a diabetic attack.
Said no problem, I'll give you a hand, but when I first walked in the door, I had to hold my breath until I left a minute or so later. Bed was set up for them, but I was gagging and puking in the parking lot. No fun!!!