Connections at your speakers' crossovers should be treated as well. So who among you has the courage to accept a bottle of Miracle Audio Contact Fluid for free? I only ask that you use it in an A/B manner(listening before and after), and applying it to as many connections as you can, then reporting back here in a few days after said application.
In the words of Lone Watty in The Outlaw Josie Wales, "You try it".
What's in it? I would never try something without knowing- why would I want to put some unknown substance on any connection in my system when it could affect them without happening immediately?
I'm not going to make the changes to my system in order to do a blind test of any kind, I'm not opening any equipment that's still under warranty and I'm not going to spend the time it would require to remove everything from my rack, disassemble what would be needed and possibly need to flush the connections again for a product that I don't believe will make any difference.
If you want to pay me, I might think about it but as a dealer/installer who has sold & installed audio equipment for close to 50 years, I'm not going to waste my time and not get something for it. Think about what you're suggesting and the number of connections in the average system, then imagine being told that it will make a difference, but you know nothing about what's in it, who is recommending it or who made it. That's a whole lot of NOPE.
I happen to like the sound of my system- doing this would be defined as naive and neurotic.