What did I do wrong and how do I fix it? Facts: Bermuda lawn, Texas 16,000 sqft that was being sprayed 4 gallon Chapin battery operated sprayed MSM (.0075 oz/1000 or .33oz/acre) Trimec Southern (.75 oz/1000) Lesco 12-0-0 Chelated Iron (8oz /1000) Spray rate 1 Gal/1000 sqft Process: Filled a measuring cup with 16 oz of water. Poured in .12 oz of MSM. Stirred. Let rest for 5 Stirred again. Divided up into (4) 4 oz cups. Therefore each cup had .03 oz, or .0075 oz per gallon. Filled Chapin backpack sprayer with 2 Gallons of water, added cup from of MSM mix, added 3oz Trimec Southern, added 32 Oz Lesco 12-0-0. Put on lid , shook it up well, added 2 more gallons, shook it up again and went to spray. Results: I noticed as I poured the Trimec Southern into the backpack sprayer that it seemed to leave a film on the filter basket. I sprayed the first 4 gallons just fine. Refilled and sprayed the 2nd 4 gallons also fine. Refilled a third time and the sprayer wouldn't spray. The line had no fluid in it, there was nothing coming from the tank. I poured it all into a 5 gallon bucket and checked the inside of the tank. It had a dark brown ULTRA tacky oily film in it. The filters were about 15% clogged. I put in water and lots of dishwashing detergent to try and clean it out and it just laughed at me. I ran my fingers inside for a while trying to scrub it and it wont come off. In fact I got the film stuck all over my finger tips and water and soap would not take of off. I was able to get about 50% of it off with paint thinner, even then it was struggle. The brown tacky stuff smells like and has the same color as the Trimec Southern, so I believe that is the culprit. However, what did I do wrong to make it gum up my entire sprayer and stick to everything? How do I prevent that in the future and what will clean it out of the sprayer now that its broken?