I'm trying to access my Router C from a laptop into Router A network:

-Router A (the one closest to internet)
gw=192.168.1.1
pc= 192.168.1.86 (pc from I try to connect)

-Router B (Ap)
wlan=192.168.10.1
eth=192.168.1.15

-Router C (Client/CPE)
wlan=192.168.10.10
eth=192.168.88.1

This is how I set static routes:
-Router A= dst=192.168.10.0/24 gw 192.168.1.15
-Router B= default gw=192.168.1.1 (both interfaces)
-Router C= default gw=192.168.10.1

Now I could ping Client/CPE ip address but I can't access to it. Neither via web, telnet nor winbox!

Can you post your configuration for router c?