Foam trapping action. Non-staining (This product is non-staining to most home siding and asphalt shingles depending on the condition and cleanliness. However, you should test it in an in an inconspicuous area for compatibility before using on these surfaces). Kills on contact up to 25 feet jet spray safe on ornamental plants & shrubs. Bengal foaming wasp & hornet killer should be used outdoors on wasp, bee and hornet nests. Guaranteed: Guaranteed to work or your money back. Guaranteed to work or your money back. Guarantee - If you are not completely satisfied with this Bengal product, call (225) 753-1313 weekdays, 9:30 am - 4:30 pm central time. Call or visit our web site at www.bengal.com for the complete guarantee. www.bengal.com.