Winter is a good time to take care of your altar. Periodically you should take everything off of it, clean up, and give it some attention. Start by removing any altar tools like candles, bowls, crystals, or wands. If you have one or more drawers for storing tools and supplies, then empty that too. Clean each of those items with a suitable cleaner or just wipe them down with a soft cloth.

Take off the old altar cloth, then wash it or hang it to air out. Clean the altar table or shelf with appropriate furniture polish. Then say:
Altar clean and altar clear,
Hold the spells that I hold dear.
By the moon and by the sun,
You support all I have done.

Now put on a clean altar cloth. Return your altar tools and supplies to their usual places. If possible, include a vase with a bouquet of fresh flowers. Your altar is now ready for use again.