diff --git a/src/geo/polygons.js b/src/geo/polygons.js
index 59b82f91..4dd6107f 100644
--- a/src/geo/polygons.js
+++ b/src/geo/polygons.js
@@ -526,7 +526,7 @@
             zed = opts.z || 0;
 
         if (opts.wasm && geo.wasm) {
-            polys = geo.wasm.js.offset(polys, offs, zed);
+            polys = geo.wasm.js.offset(polys, offs, zed, clean ? CONF.clipperClean : 0, simple ? 1 : 0);
         } else {
             let coff = new ClipperLib.ClipperOffset(opts.miter, opts.arc),
                 ctre = new ClipperLib.PolyTree();
diff --git a/src/geo/wasm.js b/src/geo/wasm.js
index 9e33106f..9ff2c98d 100644
--- a/src/geo/wasm.js
+++ b/src/geo/wasm.js
@@ -76,12 +76,12 @@ if (!self.window) (function() {
         return out;
     }
 
-    function polyOffset(polys, offset, z) {
+    function polyOffset(polys, offset, z, clean, simple) {
         geo.count.offset++;
         let wasm = geo.wasm,
             buffer = geo.wasm.shared,
             pcount = writePolys(new DataWriter(wasm.heap, buffer), polys),
-            resat = wasm.fn.offset(buffer, pcount, offset * factor),
+            resat = wasm.fn.offset(buffer, pcount, offset * factor, clean, simple),
             out = readPolys(new DataReader(wasm.heap, resat), z);
         return polyNest(out);
     }
diff --git a/wasm/kiri-geo.cpp b/wasm/kiri-geo.cpp
index 5e9ea426..259c9e71 100644
--- a/wasm/kiri-geo.cpp
+++ b/wasm/kiri-geo.cpp
@@ -85,7 +85,7 @@ Uint32 writePolys(Paths &outs, Uint32 pos) {
 }
 
 __attribute__ ((export_name("poly_offset")))
-Uint32 poly_offset(Uint32 memat, Uint32 polys, float offset) {
+Uint32 poly_offset(Uint32 memat, Uint32 polys, float offset, float clean, Uint8 simple) {
 
     Paths ins(polys);
     Paths outs;
@@ -94,11 +94,17 @@ Uint32 poly_offset(Uint32 memat, Uint32 polys, float offset) {
 
     pos = readPolys(ins, pos, polys);
 
-    // clean and simplify polygons
-    // Paths cleans, simples;
-    // CleanPolygons(ins, cleans, 250);
-    // SimplifyPolygons(cleans, simples, pftNonZero);
-    // ins = simples;
+    if (clean > 0) {
+        Paths cleans;
+        CleanPolygons(ins, cleans, clean);
+        ins = cleans;
+    }
+
+    if (simple > 0) {
+        Paths simples;
+        SimplifyPolygons(ins, simples);
+        ins = simples;
+    }
 
     ClipperOffset co;
     co.AddPaths(ins, jtMiter, etClosedPolygon);
diff --git a/wasm/kiri-geo.wasm b/wasm/kiri-geo.wasm
index 83487c75..db0d7bd7 100755
Binary files a/wasm/kiri-geo.wasm and b/wasm/kiri-geo.wasm differ