In considering not allowing DD2-4yrs to stay at grandmas over holidays

[pushchair]

Mil's house very grubby,has medication left lying around,scissors and broken glass, that sort of thing. Oh and dry poo on the loo roll holder and wall behind it.
Thats the negative.
On the positive side-
I know she would love to go,would have her big sister with her-9yrs, I would drum hand washing and don't touch any tablets into her and grandparents don't get to see much of the LOs at the moment as cash strapped and petrol costs.
I am not comfortable with it but feel that the time will be right soon. It is difficult to find a diplomatic excuse too.

Don't lie - it'll never change.
Tell them you don't think it's safe unless they clean up their shit. Do it tactfully, obviously!

dp actually told his parents that the reason we don't put dd down to run around at their house is because it isn't safe, they were very defensive "what do you mean not safe" but he just said the open drawers and no stair gates and cups everywhere. he didn't mention the dirt but when she was crawling he told them he couldn't put her down cos of all the doghairs and dog toys and half eaten chews that she would eat.