Thanks h340,
That helps already but I now know what the real problem is. When I touch the bare acrylic it hardly see any blobs. Somewhere on this forum I read that there are tiny airholes in your fingers so I get the dreft window cleaner (because the acrylic was horrible dirty) and yes with some water or dreft windows cleaner I did get a perfect blob.
So I have to take the most important step bij now (I think), put some silicone on the surface.
I will post some image and video’s a long the way.
ps I use “Commandant Cleaner” for the crip clear sides of acrylic