How do you clean blinds that are stuck(basically) in a camper

Open the doors, tape a tarp to your sills, and lay newspaper on the tarp to collect runoff.

Awesome, from almost any Dollar store, melts that stuff. A sort of yellow liquid in an excellent spray bottle. Buy a few $1 ea..

The tarp, etc is because you don’t want it streaking down your walls. You can do those later with a rag to avoid a streaking mess, but for the blinds just spray the suckers and have lots of paper towels and a trash can near by, open windows and gloves on your hands.

wear gloves...the nicotine can be absorbed by skin contact.

What kind of blinds are they and what material are they made out of?

Use a Steamer........

Mix up some Oxy Clean and water, just run a cloth over each slat!

"Awesome" from Dollar tree would work well, but be prepared with something absorbent for the runoff. I can sympathize with you and the nicotine mess. We borrowed a truck several years back and as payment we were to clean the cab, this truck was owned by 2 chain smokers. It was just overwhelming at the amount of nicotine coming off the interior of that vehicle. You would have to see it to believe it.

Thank you so much and one more question, how about the string as well, will it clean it as well?

So is there now way to take them out? If not then use warm soapy water (Mr Clean) and microfiber cloth and wipe in the direction of the slats

They are removable and replaceable. On mine I need to unscrew and remove the valance first, then the blinds. Find a good RV supply house in your area and they will be able to help you. In the interim, you have great suggestions here on how to clean them.

Thank you.

The only product I found that will remove nicotine stains is Greased Lightening. You will want to test it to make sure the fabric or finish on your blinds is color fast.

I would replace it

Here's a post that might help you https://chascrazycreations.com/dusting-hacks/