http://www.graffitiremovalwipes.co.uk/how-use methods will vary based on the surface being cleaned. When you begin, remember that:

The more rapidly the graffiti is deleted, the less chance that will other graffiti artists will leave their "tag" on your wall.
Always use Personal Protective Equipment (PPE) like gloves, protective eyewear, or anything else. and cover all uncovered skin when removing almost any graffiti using any chemicals, solvents, etc.
Use non-toxic chemicals where possible and use a gentlest method of removal so that your surface is not damaged. Always read product brands and follow manufacturer's assistance and recommendations.
Always test a small area not easily seen before looking to remove graffiti

If within doubt, talk to a professional who will be able to remove the graffiti without leaving any traces associated with.

To try and take away the graffiti from various solutions yourself, use the recommendations below:

Painted Surfaces

Painting over graffiti can be a low-cost solution to removing graffiti and is effective when a surface has been previously painted. Graffiti is normally found on lightly painted surfaces as being the "taggers" work stands out more on the light surface. Because from this, it is best to repaint the complete surface area with a dark colour as this is less attractive to graffiti vandals. If this isn't possible, paint the whole area in the matching colour so that a patchwork or billboard effect isn't created on your wall as it can certainly make a great canvas but will invite more graffiti. Not painting the vicinity in full shows that you have had previous graffiti and may attract other graffiti artists.

Before you start to help paint, test a small area first to view if the graffiti will "bleed" in the paint. If this happens, a sealer should be used before painting.

If your painted surface is at risk of regular graffiti attacks, it could be worthwhile to apply an Anti-Graffiti Protective Coating which aims to prevent graffiti from soaking in the surface. This will not stop the graffiti from being "tagged" on your wall, but may deter this "taggers" and make the graffiti easier to be removed when you need it. Some graffiti coatings can be toxic and should be applied by a specialist, so talk to you local graffiti removal technician for the various coating options that could be available.

Unpainted Surfaces

For those who have light graffiti on a great unpainted surface, you must be sure you act quickly for the reason that graffiti can penetrate in the surface making it much harder for it to be fully removed. Raw masonry surfaces are always a favourite target of taggers. Try a solvent remover, waiting 3 to 5 minutes before agitating using a wire brush then washing faraway from surface.

If the vicinity has heavy graffiti, a paint stripper ought to be applied to the surface when dry, waiting 3 to 5 minutes before agitating using a wire brush and washing away from surface.

Always read product labels and use with regards to manufacturer's advice and recommendations.

Glass Surfaces

The best approach to remove painted graffiti from glass surfaces is with a razor blade in the holder at a 31 degree angle. If all is not removed, a fine steel wool can be installed with water to take away excess, being careful not to use too much per area as this will scratch the glass.