Orvus® W A Paste 7-1/2 lb Sale! from $32.99 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Orvus WA Paste is an extremely gentle non-irritating detergent that is used to clean cattle and horses. Orvus WA Paste can also be used to clean fine rugs and will not discolor dyes.