As many as twelve close relatives of Abraham Lincoln reside in the St. Simon the Apostle Cemetery in La Harpe, Illinois. The yard was rediscovered ten years ago and the stones cleaned by a well-intentioned volunteer named Jeff Thompson.
For two months, he cut back brush with a chainsaw and mowed the plot."Comet and a wire brush" are not among the stone-cleaning implements recommended by The Association of Gravestone Studies.
To bring the remaining headstones back to their original white, Thompson scrubbed a few of them with Comet and a wire brush. [Link]
Nevertheless, the cemetery is safe from an influx of rabid Lincoln-lovers: it's marked by only a handmade sign and lacks an access road. Just like the graveyards where half my ancestors chose to hide themselves.