Keep dust, pet hair, etc., permanently out of your grand piano! 
Dust is a problem for most piano owners. Many customers ask me how to clean the dust from the area of the strings, soundboard harp and tuning pins. While I do sell tools that are made specifically for this purpose, and also offer cleaning services to customers, the best answer is to simply never let the dust get in there in the first place!
How?
With a grand piano string cover! Custom-made of very high quality, thick, 100% wool felt, these covers keep the dust out of your piano while allowing you to leave the lid up. They are hand-made and custom fit to your piano. Why wool? Because it breathes, and also because it wicks humidity away from the strings and soundboard. My customers who have these love them! And the soundboard, harp and strings stay pristinely clean! Integral battens are sewn into the cover which keep it from sagging and touching the strings. A first-class product to compliment your grand piano!
Keep your soundboard and harp spotlessly clean without having to clean it!
Keep your piano looking like this (below, left) . . . . . . and prevent it from ever looking like this (below, right).
As dust accumulates on the surface of the soundboard and harp, it eventually forms a grimy film on the surface that is difficult to remove. Eventually, the dusty grime becomes so stuck 
to the surface that the only way to really thoroughly clean it is when the 300 lb harp is removed for re-stringing or soundboard repair. Use a string cover, and it will never get dusty, grimy or dirty! The strings will stay shiny longer and the harp will retain it's rich golden lustre.
This Steinway harp (right) was so dirty it had to be entirely removed from the piano in order to be cleaned, an expensive process. A string cover would have avoided this.
Colors to choose from
I recommend and sell only Dawson String Covers, handmade in the USA using very high quality, thick, dense wool. String covers are available in four colors: black, dark brown, burgundy and white (see samples below).
Serged edging
All our covers are custom made to fit your specific piano, and feature serged edges.
Decorative stitching
Dawson String Covers doesn't make bulk batches of covers. Instead, when I place an order
based on the color and stitching you have selected for your piano, they
custom make a cover specifically for you and your piano. From scratch. Because your special piano deserves special treatment!
Depending on your preference, you may select from two styles of stitching (feather stitch and greek stitch). Available thread colors are red, gold and blue (see below). You may also select from a single or double row of stitching (personally, I prefer the look of the double row).
Feather Stitch in different thread colors:
Greek Stitch in different thread colors:
Double row Greek Stitch:
Price
Because only the highest quality 100% wool is used and these covers are hand made here in the US, and each cover is a custom order, they are not cheap. Prices start at $329. However, compared to the cost of a thorough cleaning ($30) every year and periodic polishing of the strings ($40), it pays for itself very quickly! And remember that most pianos last for sixty to eighty years. Amortized over 60 years, $320 works out to $5 per year.