Argh. Mice in the hot tub. My installer - when specifically asked by me - said "Nope. No way mice can get into this unit."
Jackass.
Hey, I'm a big boy. I shoulda' known.
I've been battling mice for over 20 years. Lawn mowers, snowmobiles, motorcycles, boat, cars, etc. Dang little buggers'll get just about anywhere ya don't want 'em.
Fully planned (and had implicit permission from THE BOSS) to put some dadoes in my enclosure panels last night.
No such luck. Spent over 3 hours tearing apart and cleaning my hot tub surround and still have hours to go. I'll post a link to a gallery of pictures for y'all to enjoy.

What a mess it is! Not to mention it's not the "quality construction" they claim. Voids in the insulation out the wazoo. You'd guess that'd saved the mice the trouble of chewing in their own little hidey-holes. Nah! They did anyway.
While I was working on it my wife and son were in the dang thing.
Oh well . . .
So, in closing, if you EVER get a hot tub inspect it
damn carefully for ways for mice to get in.