Is there a way to redo friction on foam rubber?

[Beartracks]

This is the black foam rubber padding on a bedside rail. It's gotten a bit shiny and slick, and the user can't rely on it for support without worrying her hand will slide off since there's far less friction than when it was new. It can't be replaced, so I'm wondering if anything can be done to make it provide some "grip" again?

[Alsteen]

1. Rubber

It's a good possibility that it is just very dirty. Try a good scrubbing with maybe Dawn and see if it comes clean. Things. Like the rubber handrails don't necessarily get a good cleaning and so they collect oil from hands and other dirty things that could leave the rubber slick and shiny. Try a good clean. If the detergent isn't enough use some naphtha as it will take the gook off without wrecking the foam.

[Beartracks]

3. Awesome suggestion! Will try.

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[Intractable]

2. I have used "pipe insulation" for such things. I searched Amazon for it and saw this ...

https://www.amazon.com/Insulation-Tubing-Guitar-Hollow-Protectors/dp/B0D21PM19J?niid=sxts_ai_ovws_lst_c_1_3&nrid=8FD20FF70A6A42E78612&qis=NileBrowseNode

[Beartracks]

4. Great idea, thanks!

Will keep in mind if I can't fix the original.

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[Donkees]

5. Steering Wheel Grip Tape

Steering Wheel Grip Tape for enhanced control
30 ft long for versatile application
3/4 in wide for a comfortable grip
Classic black color to match any interior
The sleek black finish not only adds a stylish touch but also ensures a secure hold

[surrealAmerican]

6. bicycle handlebar tape?

... but try cleaning it first.

[ProfessorGAC]

7. I'd Try Cleaning With Isopropanol

Can get it cheaply at any pharmacy or dollar store.
I wouldn't use a harsher solvent like acetone. That could soften it too much & since I don't know what that polymer is, I can't pay for sure.
Getting it a little tacky might be useful, but it could also get hands dirty just using it.
I like the idea above of pipe insulation. Adds a little girth, making an easy grip.