I use an anti bac degreaser that our cleaners use, put all hob bits in a pan and boil, spray a hot oven with it neat, ok if done regular. For customers i use Jangro's oven cleaner,
or oven and griddle cleaner, but cant remember where i got it, these i use in a heated dip tank.
Colin Day may also advise, he does quite a few i believe.
Andrew
ps i empty our chip pan and put 1/2" in put on to boil, keep an eye on it as it can boil over,
basket is spotless in 30 secs from hot.