Place three to four paper towels on a hard, flat surface and place the stained tablecloth on top of the paper towels.
Spray the oil pastel stain with the car part lubricant to saturate the stain. Flip the tablecloth over and lay it back onto the bed of paper towels.
Spray the other side of the stained area with the car part lubricant, and massage 1 tablespoon of dish washing liquid into the stain.
Fill your washer with hot water and pour 1 cup of the oxygen bleach into the washer. Place the tablecloth into the washer and set the rinse cycle to a warm temperature setting.
Hang the tablecloth on your bathroom's shower curtain rod to air dry. Spray the stain with a laundry pre-treater spray if the stain remains, and wash the tablecloth in the hottest water acceptable for the fabric and laundry detergent. Air dry the tablecloth on the shower curtain rod to safely dry the tablecloth.