How can money launderers legitimize Dirty bitcoin?

How do money launderers seek to legitimate dirty bitcoin? Given the anonymous and decentralized nature of cryptocurrencies, it's a pressing concern. Do they utilize complex transaction patterns to obfuscate the origin of funds? Do they funnel bitcoins through mixing services or tumblers to break the chain of transaction histories? Are there specific exchanges or wallet providers that are known to facilitate such activities? Understanding these tactics is crucial for regulators and law enforcement agencies in their efforts to combat illicit financial flows.