It isn't on all songs, but on really chord based songs like the beatles helter skelter, there is no distinguishable sound, it just sounds really thick and "clashy" The guitars aren't very distorted or particularily bassy, what can we do. Is it purely volume level based between band members or something else.
Make sure the guitars and the bass aren't clashing over boosted frequencies. A classic example is bass players scooping their mids while guitar players boost their bass. The result is the bass just adds rumble and mud to the sound of guitars.

If the sound is muddy, look at the bass and low mids on everyone's EQ.
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It is ALL about EQ.

When songs are being mixed in the studio, every instrument/drum is given its own "space" in the spectrum of low-high frequencies.

For example, if the bass is loudest at 150Hz-400Hz, then every other instrument should have frequencies in that range turned down a bit to "make room" for it.

Doing this live is not as precise, but having the guitars and bass use ~10band EQs can really help, and if you can mic/EQ the drums, you can really clear up your mix.

You get muddy sounds when too many instruments are trying to take up the same space. Bass drums, snare drums, bass, and guitar ALL have frequencies around the 300-400Hz (and there are many other places where instruments "clash"), so if you can get everonye willing to sacrifice a little bit, the band as a whole will greatly benefit.
Try and rearrange your amp and drum placements. The sound is often determined by the position of the instruments, it frequently interfers with their frequencies. For instance, if the bass is placed beside the bass drum, there will a less surround sound. But, if you have a large, hall life room, it won't matter. Just try and rearrange the position of everything and see what difference it makes.
The next step would be buying an EQ machine. I would recommend to do that first, but the method I suggested is free. It helped our sound loads. Also, try and mic up the kick drum and add more mids into the sound of the guitars, that will drastically improve your punch.
Try and have both amps sounding slightly different from each other, say the left one, your own, with the treble and bass high, with the mids around 6 o'clock. Have your mates amp with less rumble and crunch, something more biting, more mids and less bass. It adds textures to the sound that way.
Keep all sounds different from each other.
Don't max anything, that's important. Like that dude said, it's probably a mids problem. Check that out for sure.