360 Battery Tender/cleaning engine bay

Shine supply is good. I like using carpro. Exliler which is a high end quick detailer. I also use small brushes and even steam. Try also use quality micro fiber rags that only you use in the bay. You can get some great detail stuff at obsessedgarage.
My carbon parts are all ceramic coated to help and persevere carbon. I'm actually a avid detailer and love helping on stuff like this.
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Personally, I don't think the tender problem goes away with the lithium ion battery. The basic problem still exists. The alternator is just not up keeping the battery fully charged. So with a lithium battery, it may last longer before falling below critical level but it likely will eventually need to be charged just like the lead acid one that you have now.

When my battery is up for renewal, I'm seriously considering going for the antigravity battery. It's much lighter and that's worth the money to me.

As for cleaning the engine bay, I suggest spraying your product on a rag and use that to clean. Keep from randomly spraying electrical components with cleaning products. Leave the hose behind. Free running water in the engine compartment is not a positive for these cars.