The answer to your question...is it clear? Yes it was clear, or opaque anyway, When I cleaned as you described I noticed that it was also on areas of the air lines, lid, PVC framing etc. Am going to use the flowering area with potted plants first and see what other issues I run in to....then I will take onthe bubbler issues. The newest problem I have run into is that I have just installed the 150w HPS in the hood, Ballast completely on the outside of the box (to drop temp a little or keep it from getting higher actually), which is the point of my new question. I moved the box inside (avg room temp 77 +/- and not alot of space between box and wall (maybe 12"), I have built a venting assembly with 4" dryer flexhose to vent outside, to keep emitted heat to a minimum, Turned 2 of the 5 Flouro's off (1 ballast) to try to lower temps in utility and mother areas. Still at mid 80's in MR, and upper 80's / low 90's in FR.....I have installed a piece of glass in the cooling hood which covers approx. 70-75% of the hood area to divert radiant heat from HPS.....can't get temps to drop to a good level ?! I am using a 265cfm fan instead of the 150cfm listed, (3) three 1" PVC openings to get air into box, 2" PVC between rooms, 2" exhaust from FR, and exhaust as stated above....I have even tried adding a cooling vent (input) outside air into utility area to disapate heat from balasts and fan motor.....I don't know if airflow is optimal, but it will still hold a piece of paper on one MR opening, a piece of cardboard if all three covered.....is this good enough? Could I be getting radiant heat through the wall from MR & Util Room into the FR ? Is there not enough glass to prevent radiant heat from HPS Bulb?....????? Am going to run the numbers on true airflow through each of the areas in cabinet and see if there is a possibilty of increasing the flow without compromising the intent of it all. Should I insulate the FR ? Foil covered foam? HELP !!