Verruxid Treatment of Corns and Warts 10ML is based on effective and safe Castor Oil and is also easy to use thanks to the combined effect of Salicylic Acid, Castor Oil and Soft Collodion. Why use it? It is effective against corns and all forms of warts. Its third ingredient: collodion: forms, after drying, an adhesive and insulating non-colored film. How to use Solution for local application with brush. Apply the solution, with the brush, directly to the wart (without overflowing onto healthy skin), once or twice a day. Be sure to cover the wart with a dressing. Every two to three days, scrape the wart with a cardboard file or pumice stone, avoiding making it bleed. In case of bleeding, stop the treatment for 3 days.