Scrubbing - You scrub gently and you remove all the petrified, old putty that turned yellow through the years, without touching the perimetric support of the glasses.

Rubbing - You rub the surfaces free of old paint with an abrasive sponge. You can also use a thin sand paper, wrapped round a wooden block.

Smoothing and painting - When the putty dries completely, you smooth and paint matching the remaining woodwork. During painting, it is advisable to protect the glass with self-adhesive paper tape.

Frames and casings - For the window frames and casings follow the same order of work, always taking care for the correct restoration of the deteriorated spots.