So, this is a long-winded request for advice. I have a new to me 2007 Fleetwood Saratoga that I have owned for 3 years. I have only camped where there are full hookups and want do move on from that. When camping, the 20 gallon gray water tank sure seemed to fill fast, but I assumed we were just water wasters and dumped the water at our full hookup site. Well I want to boondock, so I tested what I thought was a completely empty tank. At between 6-8 gallons, water started leaking out of the seals at the input lines from the sink and shower. WHOA, I thought!!! This thing must be plugged with gunk!. I drained it. No more water came out. I removed the braces on the drain end and lowered that end of the tank about an inch. I disconnected the drain end from the line that goes to the valve. Lots of clear, non-stinky water poured out. Because of the braces I put under the drain end and the way I raised the camper to get under it I can't continue to try and drain it. I intended to remove the whole tank and try to clean it out, but now it seems there is something else going on. My dad said maybe the valve is not opening correctly to allow a complete empty. Any thoughts? I sure hate to disconnect the shower, sink and vent connections to find out the tank is perfectly clean and there is something else wrong. Thanks in advance.