The easiest to clean up is the one where

a.) You use the least
b.) You wear it long enough to let it break down short enough but before it gets too messy.

I need a solid week with my attachments and don't want to be cleaning the SFS all the frequently as it frays. I need solid hold and I show 100% hairline. So, I am not going to post my usual attachment

BUT

To answer your question 2 thin layers of this specific NX- Gen gives a great 5 day hold and is a snap to clean up:

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Get thin coats by using a makeup wedge to apply.

I-Glue also workes well and while I'm at it if you get a thin consistency acrylic like Tight Grip and you apply it really thin you should get similar results. I just never like putting acrylic on my head without a good solid dry white glue as a base/barrier.