Cleaning fuel and brake lines

Car has sat for roughly 15 years. I do not want to replace the main fuel and brake lines. The rubber brake line sections for the front brakes, YES along with any rubber fuel line components, YES. What I want to leave are the lines that run along the floor. These were factory rust proofed and are in great shape. I just want to clean the lines. I blew out both lines and the fluids looked fine, so I just want to run a cleaner through them to clear up any deposits. I know I could replace them, but that is not the plan for this car. Soooo, if anyone has flushed their lines before, what did you use? And was it a different product for each?
Thanks in advance.

Should be able to find a cleaning product like this, doesnt have to be from eastwood.

https://www.eastwood.com/aerosol-injected-cleaner-11-oz-net.html

Gas down one line, brake fluid in the other. Don't overthink it and contaminate them! Be a good time to switch to DOT 5 and save your paint..

I would just blow some brake kleen through them and compressed air. simple

An a/c flush tool works well for this.

6872n73 said:

An a/c flush tool works well for this.

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Yup... You can borrow one from Auto Zone, leave a refundable deposit.... To use it you need compressed air....

I would use denatured alcohol... It has been the preferred flush for brake systems since the 60's.... Fairly cheap, find it at the hardware store...

It evaporates quickly without leaving deposits so it' good for brakes & fuel...