Lids off is easiest. Each time a snake pees/poops, i wipe out the tubs and i spray the top of the shelf where the snake is exposed to the melamine.
Spray that then wipe it out, and put tub back in. Could you imagine a person with 50+ snakes or even 1000+ snakes having to take the tub out to get lid off and feed.
yah lol, that would be a hassle, but im not really planning on having more than like 20 or so snakes ever at any given time (hopefully)
not including the few favorites that would have full blown tanks and "natural" habitats