Can you use WD-40 on a rusted screw?
If the fasteners are stuck in their place because of rust, making use of WD-40 Penetrant Spray is the ideal solution. If the rust has reached the threads of the fastener, then there is no better way to loosen it than using WD-40 penetrant spray.
WD-40 is designed to loosen the bonds between rust and the metal surface it has adhered to by penetrating the porous layer of rust and using its lubricating properties to loosen it. To remove surface rust, simply spray it on the rusted surface, leave it for around ten minutes and let it get to work on the surface rust.
Use Rust Penetrant
You can use WD-40 Specialist Rust Release, PB Blaster, Liquid Wrench, or a similar product of your choice for this step. If you don't want to or can't use these products, you can use more common household items as substitutes. Try cola, lemon juice, or hydrogen peroxide.
All you need to do is soak the screw with the WD-40 Specialist Penetrant spray and let it work its magic for about fifteen minutes or so. The WD-40 Specialist Penetrant spray will loosen the screw enough for you to remove it with ease with a screwdriver in your hand. It's as simple as that!
How does WD-40 work for rust protection? - YouTube
While there are dozens of commercial rust removers, the acids found in pantry products, such as vinegar, lemon juice, and potatoes, can break the bonds of small amounts of rust from some metals. 1 Add the abrasive action of borax, baking soda, or salt, and you may never need to buy a commercial remover.
Remove Rust With Baking Soda
Mix water and baking soda into a thick paste and spread the paste all over the metal, making sure that rusty spots are well covered. Let the paste sit on the object for an hour or so. Use steel wool or a wire brush to scour the object and remove the rust.
How to Loosen a Stuck Screw - YouTube
If the bolt is stuck in place because of rust, you can use a bolt loosening spray such as WD-40 Penetrant Spray. This penetrating oil provides deep lubrication to loosen the nut or screw.
Pour a little vinegar or soda on the screw. wait a few minutes. Tap it with a hammer gently a few times. wait another minute or so.
How do you remove a stripped rusty screw?
How to Remove Damaged and Rusted Screws FAST - YouTube
It has a long-lasting formula to protect metal parts by blocking rust and corrosion for up to 1 year outdoors or 2 years indoors. A must have for corrosion protection.

Simply put cream of tartar in a bowl with equal parts baking soda, then incorporate a little hydrogen peroxide at a time until you achieve a paste-like consistency. Rub this mixture over the rusty object, let it sit for an hour, then wash it in the sink. Voilà!
Baking Soda (Bicarbonate of Soda) The rusted item can either be dusted with baking soda, or made into a paste with water or vinegar. Apply to the areas and leave for a an hour or so then clean off with a brush.