I buy spray specifically for visors at the motorcycle shop.  I use a cheap micro fiber towel that is not absorbent (cheap ones from Dollar General), and after spraying and letting the cleaner soften up the bug goo a bit........the cheap towel smears the cleaner around without soaking any of it up.  I then use a better quality micro fiber towel that will soak up the cleaner and dry it off.  I wrap the cheap towel around the bottle and then the better towel around it and store it in the saddle bag.

In the old days we used Lemon Pledge on airplane windshields.  It works OK - but there is a lot of wax that needs to be wiped off and the towels need to be washed more often.

Plexus is similar to Lemon Pledge without as much wax - but it is a bit expensive for what it is.

Bug Slide is good.

Just about any motorcycle dealer will have an affordable spray cleaner.  I prefer the thin liquid cleaners to the thick waxy ones.