According to the Dutch railway maintainer, it's not needed there, and the effect is not really proven: https://www.prorail.nl/veelgestelde-vragen/zomer/waarom-zijn...

Same for the Swiss, according to the natioanl railway company the results of their tests were “inconclusive”, but other operators of the Swiss network say that it depends on the exposure and other factors (but the challenge is keeping them clean, in a week they are already too dirty). https://www.rsi.ch/info/svizzera/I-binari-sbiancati-non-serv...