And... "It takes me at least 1 hour to wash and dry..." How are you so FAST?!? 
Back deck engine screen
Drifting
Joined: Jun 2019
Posts: 1,539
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From: Port Charlotte,Fl
These work great..Just fold them in half damp and push them into the vents to keep water out..As far as the open slot at the bottom of the hatch window, very little water gets in if you rinse in the right direction.
Le Mans Master
Joined: Jan 2002
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From: Ft. Myers FL
I just gently rinse that area and after I dry the outside of my car, I open the trunks and the doors and dry them as well. It's no big deal. I did the same thing with my C5. C6 and C7. It also helps if you have a good leaf blower especially on the wheels. Just saying....
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Flex182 - thanks for posting the pics. Looks like those would work well for keeping water out. But the towels mentioned above would seem to work too.
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Drifting
Joined: Oct 2021
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During about 10 washings, I kept considering and trying different methods of blocking the vents until I concluded I actually want water in the engine bay because it gets as dirty as anything due to rain here. So washing and drying the engine compartment just becomes part of the routine.
Pro
Joined: Jan 2013
Posts: 553
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From: Shelby Twp - Metro-Detroit, Michigan
During about 10 washings, I kept considering and trying different methods of blocking the vents until I concluded I actually want water in the engine bay because it gets as dirty as anything due to rain here. So washing and drying the engine compartment just becomes part of the routine.
Mariano
Le Mans Master
Joined: Jan 2002
Posts: 5,890
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From: Ft. Myers FL
Starting with my first C5 all the way until my C8 I made a continuous effort to keep the engine bays clean. Every time I washed the car I opened the hood plus the doors and back hatch and dried and kept it clean. But with the C8 it's designed to let air and of course water it too. My solution rather than blocking off all the vents is to do exactly what I did on all 3 of my other Corvettes. I applied the same coating on the inside as the outside of the car. With the C8 it's a ceramic and each time I polish the car I add it inside as well. I also blow dry the inside after washing as well . Guess what? There's no water spots or dirt buildup. 
Le Mans Master
Joined: Aug 2015
Posts: 8,243
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From: Southwest Florida
I simply place two very large beach towel under the rear screens. I’ve washed my C8 twice and the towels captured all the water that came through the vents. Obviously washing technique is the biggest factor on how much water goes through the vents.
Melting Slicks
Joined: Apr 2008
Posts: 2,582
Likes: 496
From: Hudson, NH
Water
I agree with at least to me begs the question of why do so many people whine about nothing. I for one turn down the flow of the hose and around that area and spread the soap with a semi wet micro fiber and remove the same with a semi wet microfiber. No water no issue no scratches no whining
Melting Slicks
Joined: Apr 2008
Posts: 2,582
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From: Hudson, NH
Water
the whole area with the towels and it’ll be clean as a whistle.
Drifting
Joined: Jul 2013
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From: Swartz Creek MI
Yeah I'm sure both those aftermarket solutions (Quinton Racing @ $199 and C8MAC @ $249) are making a killing on covers that probably cost less than $25 to make. And their covers don't even include the extra $35 for shipping!
C8MAC also has covers for the three small vents on the rear deck lid of the HTC that sells for $249. I would think the HTC has the least problem with water getting into the engine compartment when washing especially where those vents are located.
C8MAC also has covers for the three small vents on the rear deck lid of the HTC that sells for $249. I would think the HTC has the least problem with water getting into the engine compartment when washing especially where those vents are located.