Brush the item completely using a wire brush to remove rust and other debris.
How to white wash tin roof.
Use a mild abrasive cleaner soft scrub applied to a non abrasive pad.
Remove any rust from the item intended for whitewashing.
Mix water and mild detergent for stubborn areas.
You want this to be more fluid so it soaks in not lays on top thickly.
Using a plastic pump type garden sprayer thoroughly soak the affected allow it to sit for at least 5 minutes.
Continue all the way around until the paint looks even.
Use a rag to scrub the surface applying pressure over the wax areas to remove paint.
How to whitewash metals.
For every part water combine 0 05 part mild dish or laundry detergent.
Then dip the paintbrush into the mix and stir it around until an even consistency forms.
Opt for something soft to protect your roof s paint and parts.
Mix up some of that same white chalk paint i linked above along with a little water.
To remove mild rust stains.
If needed increase the amount to cover a larger area while keeping the same proportion of water and tsp.
Use a cloth or sponge to clean.
Remove the particles or pieces that are causing the rust stains.
Paint the entire surface with white paint and let it dry until tacky about 15 to 20 minutes.
Mix 1 2 cup of tri sodium phosphate tsp in a gallon of water in a bucket.
If you re working on a large project it may take more than one day to complete.
Now take a soft brush dip it into the solution and start scrubbing the areas affected by mold and mildew.
Them down with clean water before applying the mix and immediately after whether you cover them or not.
But remember fluid paint that soaks in is key.
Remove the detergent mixture residue with.
Tsp is available in most paint or home improvement stores.
If desired moisten the rag with water to remove even more paint.
Use light pressure to work at the stain until it is gone.
Mixing the paint to create the whitewash mix two parts flat white latex paint with one part water.