Two bathrooms and one kitchen. The outside sewers seem fine, although previously there were some roots ingress and we had to have it piped with a compound to prevent them coming back. The new issue is both bathrooms and kitchen have intermittent drainage. This is likely caused by a build up of soap scum or fats and hair. The domestic cleaning products are not good enough for fixing this problem so I'd rather a professional comes out with their proper equipment to have a manual scourer to clean out the piping and jet wash if appropriate. A brief CCTV scan of the pipes from what I understand would be appropriate to check for any obvious long term issues.