networking - Access ssh server behind two routers

I have setup a private network(Router2) within a network(class C) for TESTING purposes.

Diagram:

WAN-->Router1( Gateway 192.168.0.254)-->Lan-->Router2(Sonicwall)-->Lan(10.0.20.1)

I have setup so the devices behind Router2 can talk to the internet.

What I would like to do is setup a SSH Server behind Router 2 and connect to that SSH server from another WAN(Home)

Diagram:

WAN-->Router1( Gateway 192.168.0.254)-->Lan-->Router2(Sonicwall)-->Lan(10.0.20.1)-->10.0.20.35(SSH Server).

So how would I talk to the SSH Server from another WAN(Home) ? Router 1 port forward to Router2 IP? then do a Port forward Router 2 to SSH?