How To Clean Window Sills With Sponge. Leave for longer than usual, making sure fluid seeps into the material. For heavier smudges, apply a little bit of pressure with your fingertips.
Pull on the center of the window track or use a blade to pop the track out of place. Push the slider portion of the window open past the top block, lift the window up and out. Rinse the sponge as needed and work your way through each window.
You can use the same products and processes to clean both upvc frames and sills:
Rinse the sponge as needed and work your way through each window. Now that the windowsills are clean, maintain by dusting weekly or every two weeks as part of your routine house cleaning. Leave for longer than usual, making sure fluid seeps into the material. For stubborn dirt, use a toothbrush, or an old credit card.