There may be a few DX-ers around who, like me, have to live with a Loran C station in close proximity. MW DX is not always easy in such circumstances. And if you happen to own one of these wide-spectrum SDRs, like a Flex-Radio SDR-1000 or an RF Space SDR-14 or-IQ, you're asking for trouble. What I've seen of commercially available tools for removing/reducing Loran C noise have not impressed me.
So let me introduce my secret weapon the last solar cycle, the Stefan Wikander Ultra-Deep Loran C Notch Filter! Download the pdf file here.