Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to improve the sound of your stereo system for less than $100 [title] Keep all of your source material clean. [step] Dirt or oil on your cds or vinyl lps will keep them from sounding their best. Cleaning them regularly costs very little and can make a tremendous difference in the sound quality of your system.

Ending1: [substeps] Clean cds and vinyl lps in the same way you would clean an electronic system. By cleaning them manually every day, you reduce the amount of fingerprints and residue that can accumulate on them. Ending2: In addition, the owner's manual should tell you how often to clean them and are there any warranty instructions you can follow for good results. [title] Purchase a professional refinished stereo system. Ending3: Vinyl can be cleaned with either mild soap and water or a mixture of alcohol and water. Cds are best cleaned using a commercial cd cleaning spray and a lint-free cloth. Ending4: : [title] Wash your cd or vinyl lps with a soap based cleanser. [step] Using soap to clean your vinyl lps is a necessity, as bleach can quickly wear down your system and make them sound duller.

Answer format: ending1/ending2/ending3/ending4