greetings friend,I would recommend over-the-counter liquid salicylic acid
. These are available already on that and work well use them multiple times daily for about a month to destroy the wart
are usually caused by viruses and can spread.however he did not need expensive lasers or radiowaves to treat these.the warts probably have been building up for decades or years, so I would not expect them to go away immediately. If not treated, they are not dangerous, and will only produce pain, but no long-term medical problem. Cheers.