My mother is bed wetting; where can I get plastic sheets the waterproof mattress pad & depends r not working?

She does have Alzheimer’s so I really need plastice sheets
It’s hard to work with her on this, she’s pretty much lost control
and takes off the depends at night while she sleeps and just goes.
I do her sheets twice a day, the “hospital pads” dont cover every inch of her mattress though I try; they move and then and urine seeps thru.
Can somebody guide me to where i can buy fitted plastice or old fashioned rubber sheets for a full size bed?

I just searched for “rubber sheets” and got http://www.bentonmedical.com/sheets.html among others. I’d guess any sort of medical supply company would carry these. There are also special mattresses you can buy that have a coating of plastic on top of them.

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