Go down the petty station, get £5s worth of petty. Put it in a large bucket and submurse the inlet in it and leave to soak for a few days. Wash out with a hose or pressure washer. Jobs a goodun
Oh and use a bucket with a lid
Or even better. Go down pound land and get a £5s worth (5L) of oven cleaner you wont believe how well that works and it cheap from pound land
Oh and use a bucket with a lid

Or even better. Go down pound land and get a £5s worth (5L) of oven cleaner you wont believe how well that works and it cheap from pound land