Back to my original question for you,....how do you display your larger items, like trucks, trees, cars etc., & keep them from getting covered with dust ??
No display of larger items (due to lack of suitable display case)
Only exception is the display case for the cars we currently drive and drove in the past (one display tower for me wife, one for myself) -- actually this is no Playmobil stuff but customized as well (I bought the 1:18 model cars and painted them in the original car color).
Anyway such a display tower would also be perfect to display larger Playmobil items (but not for me as my wife forbid me to display any Playmobil stuff in our living room so I have to settle for the display case just in my office right over my desk
... although I managed to bring up at least one Playmobil part in the display towers used as stand for the car flyers (cf. detail pic)
We bought the towers at IKEA (they have been quite cheap). Drawback is that there are gaps between the glass elements and so dust also finds its way to the inside, although not that fast as on open shelves.
I have tried this procedure myself with my large shop compressor, but it causes too much mayhem by blowing the small pieces about, & dosen't thoroughly clean items as good as soap & water ! I'm still at a loss for a better procedure !
For larger items I used a steam cleaner. Quite less dangerous to stickers than pure water although I must state that I never had a problem with original Playmobil stickers in the washing machine: they all got stuck on the item and didn't become any damage resulted from the washing procedure.