IPC-CH-65B outlines several cleaning technologies to match your specific contamination type:
If you find an old "IPC-CH-65 PDF" online, it is likely outdated. Seek the IPC-CH-65B PDF or the latest IPC-CH-65-CN for current best practices. ipc-ch-65 pdf
The dominant modern method. It uses water-based chemistries and is highly effective on water-soluble and many no-clean fluxes. ipc-ch-65 pdf