Not sure what type of sliding windows you got.If it got a runner on the bottom with wheels running on it,they usually have a grommet which need to be remove and adjust with screwdriver inside the hole and turn it clockwise or anti-clockwise.If you got sliding secondary glazing,clean the groves with WD-40 or do you mean what is known as in England, sliding sash window ? Need more information............
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local