Permanent cowl cleanouts?

I got the inside of my cowl painted yesterday. I used Eastwoods internal frame coating.
Eastwood Internal Frame Coating 14oz Aerosol
Prior to painting I ran a camera system up through the cowl to inspect it for cleanliness and to check for damage....looked perfect. Steel Dragon Tools® Model 710DN Pipe Inspection Camera with DVR and 130 FT Cable | eBay
From what I can see the eastwood product did an excellent job. I will run the camera back through in a few days to see if it missed any spots. I used two cans for the cowl.
Btw, I decided not to cut any extra access holes. I was able to go in through the many small holes with the eastwood wand.