Cleaning a grand piano is different than cleaning an upright piano. Safely raising the grand piano lid, removing the music desk, and removing the fallboard (nameboard) , as well as instructions for the do-it-yourselfer to thoroghly clean the grand piano are covered here.
Cleaning_Your_Grand_Piano.html
This is a description of the procedure for cleaning your upright piano, including disassembly and reassembly of case parts to access the inside of the piano.
Cleaning_Your_Upright_Piano.html