I purchased my "Steam Buggy" from AOL nearly ten years ago. I still have the original provided operating instructions. You are supposed to fill the reservoir with tap water only and with the appropriate amount. They included a convenient measuring cup which had a "fill to this line" amount of water. If you don't have this measuring cup, the exact amount is 2-cups of water.
After doing this, turn the unit on and point the end of the steam hose into a sink or tub. The unit will squirt water out until it gets hot enough to produce steam. When it gets to this point you are ready to clean.
After the water has run out of the reservoir, turn off and wait 5-minutes before removing cap to refill with water.
Other than the above, the original instructions are pretty brief, and I don't see any contact for replacement parts. It does have on the instructions, that it was distributed by Tristar Products in Laureldale, Pennsylvania. It was made in China
Ron Sells, June 2009