A lot of oven cleaning gels are made by same company but are packaged under own labels ,I use a lot of pound shop oven cleaners, type with bag to soak racks in, but I don't use the bag. I too have a Lakeland tray, sharp blades and wire wool are a must,strip oven parts down and coat parts with a sponge with the gel ,leave to soak while coating inside of oven with the same gel.Then clean off the parts using a metal pan scourer .Use soapy water in Lakeland tray to rinse parts in.sharp blade for inside oven and glass after coating in gel. Use pan scourer on inside of oven.Wipe down and polish oven with a spray polish, takes about 1/2 hours