I was thinking about the mouse pee issue again, you absolutely need to stop the caustic corrosion as washing and rinsing just doesn't do it. The only way to guaranty permanent elimination is with a enzymatic cleaner that pulls the pee out and eats it up. Yum.
So anyhoo, my mind turned to the 'Nature's Miracle Super-Oxygenated Stain & Odor Remover' product we used to clean up after one of our Black Labs suffered from canine epilepsy. It is an oxygen-infused, bio-enzymatic formula designed to react to organic stain and odor matter and works to eliminate any traces of urine, feces, drool, vomit and other pet messes, strong pet urine odors, yellow stains and the sticky residue left behind after pet urine is efficiently removed. Great stuff, we bought it by the gallon and couldn't live without that and the carpet steamer. (R.I.P. Sophie Girl ^-^).
Thinking it might be worth following up on, I posted the question to the manufacturer's online "Ask The Expert" FAQ forum and got an answer:
Q.) Hi, I have found mouse nests, droppings and urine in my stockpile of 2.5" dia. x .065" wall 6061 T6 aluminum tubing. Which product(s) would be best for cleanup and effectively neutralizing the long term corrosive effects of mouse urine? Thank you.
A.) Thanks for asking! The best product to tackle the mouse mess is our Advanced Stain & Odor Remover. As long as it remains wet it will continue to 'eat' the urine until it is completely eliminated. You may want to use a garden sprayer, or purchase one of our battery powered units, to make sure the spray reaches the inside of the tubing.
Wife says it cost about $20-25/gal. at WallyWorld, PetSmart etc. Don't buy the Advanced Formula, it just adds some fragrance which we found both redundant and unnecessary as you are eliminating all odor anyways (kudos to the marketing team I guess). So there you have one good, cheap (at least, relatively to the AlumiPrep/Alodine treatment) mouse pee neutralizing option that should work and provide peace of mind. You sure don't want to fly or pass along a plane knowing it has a spar corrosion issue when it can be resolved so easily, IMHO. According to the Directions you must saturate the areas, maybe more than once, and let dry naturally. Best to treat your wings ASAP so the ribs will be completely dry by recovering time.
Directions:
(Stain Removal) Wipe away any excess stain-causing material, and then soak the surface thoroughly with Nature’s Miracle Stain and Odor Remover. Wait 5 minutes, and then wipe away stain with a cloth. For tough stains, use a stiff, bristle brush. If the stain is not completely removed, re-soak area and allow Nature’s Miracle Stain and Odor Remover to work for 1 hour before wiping with a cloth.
(Odor Elimination) Thoroughly soak the entire area with Nature’s Miracle Stain and Odor Remover. For carpets, apply enough to reach the urine penetration in the pad and floor. This may mean lifting the carpet and applying directly to the pad and floor.
Allow the product to air dry. Depending on air circulation, carpets and upholstery may take up to 2 weeks to dry completely. If after 2 weeks there is still an odor, Nature’s Miracle Stain and Odor Remover has not reached ALL of the odor-causing material. Pinpoint odor source and repeat cleaning process. Keep the product away from children and pets and do not allow pets onto the treated area until it is completely dried.
Tips:
Always test surfaces to be treated for color fastness by applying to a hidden area and wiping with a cloth. If color is removed from the test area, do not use Stain and Odor Remover on this surface. Always use Stain and Odor Remover at full strength for best results. Use Nature’s Miracle Stain and Odor Remover before any other product as cleansers and detergents may chemically “set” the stain.
Stain and Odor Remover is not recommended for use on silks, leather, or suede.