Don't use regular simple green or purple power as neither are great for aluminum unless 100% is rinsed off.
This is the over the counter version of the simple green product that is approved for airframe use and is safe no matter how long it is left on aluminum.
https://www.lowes.com/pd/Simple-Gree...eaner/50386662
Exactly the same as the simple green extreme precision and aircraft cleaner but with purple dye and much cheaper.