Bosch SGS5362GB/01 not cleaning properly on the bottom layer

Hi Guys,

Hoping you can help.

My 10 yr old Bosch SGS5362GB/01 is not cleaning dirty pots/pans etc properly on the bottom layer. Most of the lightly soiled stuff on the bottom is coming out clean and the top layer items are all coming out spotless. We are using the same Lidl dishwasher tablets we have used for a while which have always worked well for us.

I suspected maybe the water spinnner thing on the bottom may have been blocked with some debris/plastic packaging or something so have taken that out and checked/cleaned it – it seemed fine with no spout holes blocked.

Ran the dishwasher on a 70C cycle and opened the door halfway through and water seemed hot with steam bollowing out so not much wrong with the water heating side of things.

Have washed the grill pan from the oven in the bottom today and the grease on the grill looks like its been lightly tickled and not washed off at all ?

Any suggestions on what might be up? is there a supply pipe to the lower level spinnner I can easily check for blockages ?

The dishwasher is running fully through cycles and the water is being pumped out at the end of the cycle as normal.

Bit stumped !