Ron
I can't tell if that fryer is missing the front door or not,but if it has the front door and they keep it closed,that fryer tank leaks and is a fire hazard.If it is missing the front door and that grease build up is from splashing grease it is also a fire hazard.You can tell if you look on the bottom of the fryer tank and you see grease oozing out of one of the seams.It's best to toss the fryer and buy another one,since welding the tanks is usually a short term fix,and replacing the tank on a standard 40lb fryer is not usually worth it(it is on a pressure fryer since they are roughly $10k new).If you choose to clean it charge them high,because after you clean it and it does not work right the cost to repair it by a restaurant equipment repair company will be a lot more than the price of cleaning.I would stay away from it unless they are a good customer and you explain the liability before hand.That fryer is a cheap fryer,but many pieces of restaurant equipment costs into the thousands of dollars,and some of the computer boards are upwards of $1k with the labor and it is better to stay away from cleaning.Steam vapor machines and good degreaser reduce the chance of water intrusion on expensive control panels and melt the grease,but sometimes the build up is so severe only a hot pressure washer is the only thing that will make a dent in it.Cleaning restaurant equipment is one of the things I hate the most,restaurant equipment is a side business of mine(I have a whole warehouse full of it)