So, I tried using the latex gloves I use when working on the car (changing oil, etc.) and was able to just barely put it over the air filter housing opening. However, after a few drops of water settle in the middle of the glove, they popped off...so that was out.
I then used the old trust grocery bag method and it, as before, did the trick...it's just annoying to use them for me lol. I'd prefer a small cover that pops on and off.
Using Larz' advice (I've always cleaned my engines - for the last 12 years I've been driving - at the car wash), I tried my hand at home. Put some Purple Power into a spray bottle, sprayed EVERYTHING down, let it sit for a minute and then started to brush it with a pre-soaked brush. After that I used the shower setting on my garden hose and rinsed it off. Engine came out much cleaner.
Took it for a spin to air dry it out.
I then followed it up with a manual effort to remove any spots the brush missed with a microfiber towel doused in Windex. Cleaned everything right up.
I didn't have BPM (SAT #51) playing though hahah...had some good ol country music goin.
Results:
Before:
After: