[Bakr]

The closest solution I've seen so far is the first reply to this thread:

pawn Code:

for( new i = 0; i < 2048; i++ ) // Loop through all possible textdraw IDs
{
   if( i != INVALID_TEXT_DRAW ) continue; // If it's not a valid textdraw, move to the next itteration
   TextDrawHideForAll( Text: i ); // Hide the textdraw
}

To show the textdraws, simply change TextDrawHideForAll to TextDrawShowForAll.