The fishing market is 600B $... So if they invest 1% of that market size into the cleaning, they can go on with current practices... They can even improve the process and make it cheaper.
To put 1% in more context, the biggest companies like P&G, Verizon, Progressive Insurance etc will never spend more that 3% of revenue MAXIMUM on their total marketing budget..and that is money that they directly measure ROI from.