I had one plumber who after looking around my trailer wanted to see the floor drain, which my trailer doesn’t have. Just listening to him talk I asked him to leave as I knew he wasn’t going to be able to handle it. I phoned around looking for another & one guy told me that he was positive it was kitchen grease & my drain pipes would have to be replaced. Being a senior on a very limited pension, I finally called Expert Plumbing & Drains. The resort where I live has used them for many years. The man was very polite & professional. He had a look in the cramped spaces he had to work within & got to work. I watched tv & before I knew it he told me he was done! He was able to unclog the drain from over 30 yrs of built-up grease, (not all mine), with a special flail-type snake which reamed its way over, around & down, blasting through the clog. He also went where no one dares to go— under the trailer to check to make certain things were moving once again. The best part was the final bill which I was able to pay before he left. It was much less than I had expected. This will forever be my "go to" plumber.