[Randy More]

I recommend you use ZCMD, however, a normal command that you will have to put under OnPlayerCommandText callback:

pawn Code:

if(!strcmp(cmdtext,"/removemyobjects", true)) // If the command submitted.
{
    for(new ao; ao < 10; ao++) // This loops through the ten slots, so all codes between the for braces will happen for the ten
    {
        if(IsPlayerAttachedObjectSlotUsed(playerid, ao))  // Checks if the slots are used.
        {
            RemovePlayerAttachedObject(playerid, ao); // If so remove the object(s).
        }
    }
    return 1;
}