Windows open, fan blowing, use spot cleaning fluid or "Carbon Tetrachloride" to lift the stains. It should take a few applications, but the wax in the crayons should be dissolved by the solution.
If you're brave and extremely careful, you can also try mineral spirits, but again, keep the window open and turn on a fan.
Remove the crayon stain as soon as possible after staining. The longer you wait, the more difficult it is to remove. If you have already laundered the upholstery it will be nearly impossible to remove. If you haven't already laundered it, saturate the area with pre-treatment laundry stain remover (aerosol types work better on greasy stains). Then wait one minute for the product to penetrate the stain. For stubborn stains, rub with heavy-duty liquid detergent. Launder afterwards immediately. If color stain remains, soak/wash in chlorine bleach if its safe for fabric, or in oxygen bleach. For extra heavy stains, apply dry cleaning solvent to back of the stain over absorbent paper towels. Let it dry, then rinse.
If this doesn't work, you can also scrape the excess crayon with a blunt knife. Wash it in hot, soft water with soap, and one-half cup baking soda for 10 minutes. If the stain remains, make a soap paste into stain. Wash for five minutes and rinse. To remove remaining color, use bleach or color remover as safe for fabric.
Shampoo your carpet with resolve dual power for carpets.
You can almost certainly get crayon out off upholstery with a Magic Eraser or some other solvent.
scratch it off
look for it
If its a cheap sofa then you probably are not going to use nice fabric so all you need to do is take off the current fabric and then use a staple gun to to affix the new fabric.
Hold a bag of ice against the mark until it becomes cold and then scrape the mark off.
A sofa cover is a removable fabric or material that is designed to cover and protect a sofa's upholstery. It can be easily put on and taken off for cleaning or to change the look of the sofa. Sofa covers come in a variety of colors, patterns, and materials to suit different decorating styles.
It comes off by itself but if it doesnt then just wash it and it should come off then.
You can almost certainly get crayon out off upholstery with a Magic Eraser or some other solvent.
Do not follow random home remedy suggestions - you will likely ruin your sofa. Look on the back bottom edge or underneath the sofa and look for a swatch (small sample piece) of the material. If there is not one, consider snipping off a small piece from an area that does not show and will not be missed. Take the sample to a fabric store and ask politely for what you need to restore sheen. A wise old lady that has seen it all and has great wisdom will produce the answer you seek.
you should be able to buy a spray can of Graffitti remover. If the mark has been made by a wax crayon a stiff wire brushing should help, maybe a strong solution of household bleach. Hire a pressure washer and blast it off. If all else fails, after a few months it will have probably worn away
If the oil painting has dried completely or is varnished (has a sheen to it), and the crayon mark isn't too large, wiping it with a soft warm damp cloth that has a drop or two of Murphy's oil soap on it could get it off. Crayon is wax and once an oil painting/varnish has dried, it is a pretty tough surface, so you might also try blotting the crayon with a soft cloth that has been soaked in really hot water, and then scraping the softened crayon off with your fingernail.
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ยจGet them (those) dirty dogs off my clean sofa!ยจ Shouted Nana
Tailor's chalk is a type of chalk used by tailors and seamstresses to mark fabric for cutting or sewing. It comes in various colors, such as white, yellow, or blue, and is designed to easily brush off fabric without leaving a permanent mark. Tailor's chalk is a useful tool for making precise markings on fabric that can easily be removed after the garment is completed.
I think it will flake off. The crayon has an oil and wax in it and that means the paint won't adhere to the surface.