Ok, I'm only 15 and a half. We've had a Ford f-150 since 1997, and it is officially mine. We use it for hauling stuff. There was a bunch of crud inside, so I've spent a few days cleaning it out. I have it cleaner than clean. This is the cleanest I have ever seen it. The only problem is, over the years, things have been spilled all over and then ground in. My mom staes she has used Brissle Carpet cleaner and it won't come out, but I've learned it's good to sort of "double check" everything. Haha. I would like to know if anyone has a remedy for getting VERY tough ground in stains. Elbow grease is also available

All help is GREATLY appreciated. I want this truck to be as clean and good looking as possible.