I use Plexus for the plastics.....I think it was designed for clear plastics such as aircraft windscreens etc but it works well on any plastic especially for removing flies and other buggerations.

If you use it regularly on your visor it removes/fills small whirls and cleans up well.

 

I use aerosol furniture polish (any brand) as it's just a general purpose wax based polish.
I was told that this is what most dealers use for their showroom bikes too.
Both my SD990 & 1190 Adv get the pledge treatment on the plastic panels after each wash (or partial wash to clear the bugs) and it gives them a nice deep gloss.

Some detailers also recommend to spray the front down with wax before washing and to leave it for 10 minutes to soak in as the wax softens the bugs so they can be washed off easier.

 

I've used Xerapol plastics/acrylics polish for nigh on 20 years which gives excellent results and with some patience will remove scratches. Do not use on painted plastics as it is an abrasive. Use only on clear or pigmented plastics such as clocks/screens/indicator lenses/headlight/moulded panels. It also does a brilliant job of cleaning up the dulling on the outside of plastic car headlight lenses. On solid panels I usually find a quick once over with Mr Sheen after cleaning with Xerapol gives it a good shine.

Pardon our interruption...

Nigel

 

The other method for really scratched stuff, as long as the plastics are solid colour (i.e., orange/white right through - pigmented plastics) is pass a heat gun over the scuffed bits. This sort of heals the plastic and gives it back a gloss. Needs some practice to get it right though.