Why, if I wash my Yorkshire pudding tin in the dishwasher...

[JenaiMarrHePlaysGuitar]

does it develop a weird, rubbery, plasticky film?

Is that not the coating coming off it?

No, I don't think so. I tried Googling and found mention of the oil polymerising

It has only happened after making Yorkshires - it didn't happen when I used the same tin to make muffins.

That may be your answer then...

is the extra oil? I dont do my baking trays in the dishwasher as I have to end up washing them again when they come out anyway

Thing is, I put roasting tins in the dishwasher all the time and they never get polymerised (or whatever it is).

Maybe it's the oil combined with the protein from the eggs...

I guess I should refrain from putting my Yorkshires tin in the DW, which is easy enough. But I want to know why it happens.

We need a scientist to explain. Or Heston - I bet he knows.

Doesn't happen with mine. And I've used different fats before. How peculiar.

i havent washed mine in 14 years so cant help.