I guess I'm surprised by two things. One, you stuck with Sonicare through Philips' purchase and put up with a lot more of those magnets coming unbonded from those expensive brushes than I thought a person could. And two, the screen woven through the louvers looks as good as it does on your car!

For a while, years back, I'd treat the outdoor cars to a cowl slot covering made from some kind of shelf liner I nicked from SWMBO's collection -- a rubberized waffled material with roughly 1/4" holes for breathing I held it in place with a piece of foam caulking backer rod (1/2" diameter I think) pressed into the end louvers. Have a pic somewhere, I'm sure, as I've not done much to Volvos without taking photographic notes.

Unlike your fiberglass screen, this shelf liner deteriorated seasonally. After a year, it needed refreshing.

Only thing I'd warn you about is the magnets. Unencapsulated, they will probably leave rust stains. Nice magnets though. I've saved them too. Usually did not need to break them off of the tuning forks, as that is how they'd die.
--
Art Benstein near Baltimore

Welding is easy, it's like riding a bike. Except the bike is on fire...you're on fire...everything is on fire, and you're in hell.