Upon arrival found drain line clogged again. Went outside, and found snake hanging around drain line. Showed and explained to customer that the snake could be getting inside and clogging the drain. We do not carry a small enough screen to keep small snakes out. Cleared drain line out and explained to customer they need to cover the drain so this stops happening. Again we can run a drain line out the sofet, and a price has been made. This is not a callback. Tried to call him(the husband) to get credit card and could not get ahold of him, we will need to call him again to get payment. Explained to wife if this does this again we will need to run the new drain line.