Cleaning.
To remove dust and dirt from rattan furniture, I recommend that you use a clean cloth and moisten it in water with a splash of dish detergent. Finally, dry well with a soft cloth and leave it outdoors but in the shade.
Restoration.
Synthetic rattan is also broken, so you will need to do some repairs. Once you've cleaned and dried your rattan furniture, take a close look at it for any breaks. If the damage is small, for example loose strips, using a nail gun and strong glue you can solve it. Otherwise, you will need the advice of a professional.
Remove stains.
To remove stains, prepare a solution by mixing one part white vinegar with two parts warm water. Dampen a sponge in the solution and rub over the stain, until it comes out.